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Caterpillar 456-3544 is the Caterpillar type electronic common rail injector with a top mounted connector, three sealing O rings and a stepped nozzle body. It is used on Caterpillar C7 and C9.3 engines. This aftermarket version is made to the same mounting and connections as the original, so it fits where the old one came off.
The same part is also sold as Caterpillar 20R-5079.
Sold as one unit. Check the number on your old part, or in the parts manual for your machine, before ordering.
| Part Type | Fuel Injector |
| Replaces | Caterpillar 20R-5079 |
| Injector type | Electronic common rail |
| Engine | Caterpillar C7, C9.3 |
| Machine | Caterpillar 336E |
| Cross references | Caterpillar 456-3544 |
| Fits | the Caterpillar C7 and C9.3 diesel engines, including the C9.3 in 336E excavators |
| Condition | New, aftermarket |
| Stat. HS-Code | 840999 |
| Country of Manufacture | China |
Machines
Check the part number on your old unit before ordering.
| Caterpillar Part No.(SPM Part No.) | Fits |
|---|---|
| 20R-5079(SPM-HEP-4813) | the Caterpillar C7 and C9.3 diesel engines, including the C9.3 in 336E excavators |
| 456-3544(SPM-HEP-4813) | the Caterpillar C7 and C9.3 diesel engines, including the C9.3 in 336E excavators |
What it does
A common rail injector opens electrically several times per combustion stroke, spraying fuel at very high pressure. Its timing and flow are set by the engine controller using the trim code on its body.
Where it is used
Made for the Caterpillar C7, C9.3 diesel engines and including the C9.3 in 336E excavators. The full list is in the tables above.
We check what other aftermarket sellers charge for this same part. Their prices on the date we checked:
| Seller | Price | Checked |
|---|---|---|
| eBay (6 aftermarket sellers) | USD 230.85 to 243.51 | 1 Nov 2026 |
| eHeParts | USD 239.80 | 2 Nov 2026 |
| SINOCMP | USD 349.00 | 1 Nov 2026 |
| FridayParts | USD 357.00 | 1 Nov 2026 |
| DeedParts | USD 419.88 | 2 Nov 2026 |
| Spare Part Mart | USD 193.22 | Today |
Our price of USD 193.22 is 16% to 54% less than these sellers.
Found this part cheaper somewhere else? Send us the listing and we will beat it by 5% under our Price Beat Guarantee. Every order is also covered by our 30 day money back guarantee.
Yes, it was made for the Caterpillar C7, and 2 more listed under compatible equipment. Check the old fuel injector is marked 456-3544 or one of the cross references, because makers change parts between serial ranges.
On the Caterpillar C7, often 5,000 to 10,000 hours, but much less on poor or wet fuel. Injectors are usually changed when they fail a test, not by hours.
Black or white smoke, a misfire or knock on one cylinder, hard starting, higher fuel use, or a high return leak or balance rate on test.
Clean the bore and seat of carbon, and keep the nozzle capped until it goes in. Torque the clamp to the engine manual, not by feel.
Always. Fit a new copper washer and O-rings under every injector you remove. A reused washer leaks combustion gas and carbon packs the bore.
No. It is an aftermarket fuel injector made to replace the Caterpillar 456-3544. It is not made by the original manufacturer; the number only shows what it replaces.
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